Most of the printed matter that you see in your everyday life is printed from only four colours. If you take a magnifying glass and look closely at a newspaper or leaflet, you will see the following colours; cyan, magenta, yellow and black. Some shades however,
The press prints by writing the image to a digital plate. It starts by the writing the yellow, erasing it and then writing the magenta, erasing it etc…each time transferring the plate image to the paper before erasing it for the next, until all four colours are printed.